Control of the optical properties of CdTe nanocrystals by selective exchange of Te with thiolate: effect of organic ligands on the formation of core-shell structures

Physical Chemistry Chemical Physics : PCCP
Takaaki TsuruokaHidemi Nawafune

Abstract

Changes in the optical properties of CdTe nanocrystals through selective surface exchange reaction with thiolate molecules in the organic phase are studied with an aim to investigate the mechanism and the role of organic ligands. The reaction was mediated by dissociation of Te anions via oxidation in air from CdTe nanocrystals, followed by attachment of thiolate molecules in a 1:1 stoichiometric manner. This results in a gradual shell formation and a corresponding decrease in the size of the fluorescent CdTe cores, which induces a blue shift of both the absorption edge and emission wavelength in the visible region. A systematic study including the addition of ligands at different concentrations revealed that Te dissociation is the rate-determining step for the process and the degree of blue shift is significantly dependent on the amount of organic ligands present. The process could also be kinetically controlled through the addition of an excess amount of thiolate ligands, allowing systematic tuning of the emission properties of nanocrystals under ambient conditions.

References

Sep 25, 1998·Science·M BruchezA P Alivisatos
Oct 13, 2000·Science·V I KlimovM G Bawendi
Mar 29, 2001·Journal of the American Chemical Society·Z A Peng, X Peng
Jun 5, 2003·Journal of the American Chemical Society·Robert E Bailey, Shuming Nie
Jul 10, 2003·Journal of the American Chemical Society·Xinhua ZhongWolfgang Knoll
Feb 11, 2005·Journal of the American Chemical Society·Kensuke AkamatsuHidemi Nawafune
May 25, 2006·Journal of the American Chemical Society·Zhiyong TangNicholas A Kotov

❮ Previous
Next ❯

Citations

Mar 11, 2015·Luminescence : the Journal of Biological and Chemical Luminescence·Bin ZhangRutao Liu
Dec 24, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Chun-Lei WangYi-Ping Cui

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

Related Papers

Journal of the American Chemical Society
Kensuke AkamatsuHidemi Nawafune
Physical Chemistry Chemical Physics : PCCP
Jianmin ShiKlaus-Dieter Becker
Luminescence : the Journal of Biological and Chemical Luminescence
Ning Liu, Ping Yang
Journal of Nanoscience and Nanotechnology
Chunhua LuoJadranka Travas-Sejdic
Journal of the American Chemical Society
Takuya NakashimaTsuyoshi Kawai
© 2022 Meta ULC. All rights reserved